Abstract
We report, as an example, a complete analysis of nuclear spin-lattice relaxation time $({T}_{1})$ data for the strongly correlated antiferromagnet ${\mathrm{UPtGa}}_{5}$, which has a typical ${\mathrm{HoCoGa}}_{5}$ (115) structure. Using a high-quality single-crystal sample, the $T$ dependence of ${T}_{1}$ at $^{195}\mathrm{Pt}$ and at two crystallographically inequivalent $^{69}\mathrm{Ga}$ sites has been measured for $H\ensuremath{\parallel}a$ and $c$ axes. Using previously obtained hyperfine coupling tensors from static Knight shift results, the anisotropic spin fluctuation energy and $\stackrel{P\vec}{q}$ dependence of the dynamic susceptibility have been determined completely, forming a clear contrast to the cases of superconducting ${\mathrm{CeRhIn}}_{5},\phantom{\rule{0.16em}{0ex}}{\mathrm{CeCoIn}}_{5}$, and ${\mathrm{CeIrIn}}_{5}$, which are considered to be very near to a quantum critical point. We also note that a similar hyperfine coupling scheme to that of ${\mathrm{CeRhIn}}_{5}$ has been found for ${\mathrm{UPtGa}}_{5}$.
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